Improved high temperature performance of La0.8Sr0.2MnO3 cathode by addition of CeO2

被引:16
作者
Wiff, J. P. [1 ]
Jono, K. [1 ]
Suzuki, M. [1 ]
Suda, S. [1 ]
机构
[1] JFCC, Atsuta Ku, Nagoya, Aichi 4568587, Japan
关键词
SOFC cell; LSM; High temperature; Co-sintering; La2Zr2O7; CeO2; RAY PHOTOELECTRON-SPECTROSCOPY; OXIDE FUEL-CELLS; CRYSTAL-STRUCTURE; MICROSTRUCTURE; CONDUCTIVITY; STABILITY; MANGANITE;
D O I
10.1016/j.jpowsour.2011.03.102
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ceria is proposed as an additive for La0.8Sr0.2MnO3 (LSM) cathodes in order to increase both their thermal stability and electrochemical properties after co-sintering with an yttria-stabilized zirconia (YSZ) electrolyte at 1350 degrees C. Results show that LSM without CeO2 addition is unstable at 1350 degrees C, whereas the thermal stability of LSM is drastically improved after addition of CeO2. In addition, results show a correlation between CeO2 addition and the maximum power density obtained in 300 mu m thick electrolyte-supported single cells in which the anode and modified cathode have been co-sintered at 1350 degrees C. Single cells with cathodes not containing CeO2 produce only 7 mW cm(-2) at 800 degrees C, whereas the power density increases to 117 mW cm(-2) for a CeO2 addition of 12 mol%. Preliminary results suggest that CeO2 could increase the power density by at least two mechanisms: (1) incorporation of cerium into the LSM crystal structure, and (2) by modification or reduction of La2Zr2O7 formation at high temperature. This approach permits the highest LSM-YSZ co-sintering temperature so far reported, providing power densities of hundreds of mW cm(-2) without the need for a buffer layer between the LSM cathode and YSZ electrolyte. Therefore, this method simplifies the co-sintering of SOFC cells at high temperature and improves their electrochemical performance. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:6196 / 6200
页数:5
相关论文
共 18 条
[1]   Intercalation/Deintercalation of Oxygen: A Sequential Evolution of Phases in Ce2O3/CeO2-ZrO2 Pyrochlores [J].
Achary, S. Nagabhusan ;
Sali, Sanjay K. ;
Kulkarni, Narendra K. ;
Krishna, P. Siva Ram ;
Shinde, Anil B. ;
Tyagi, Avesh. K. .
CHEMISTRY OF MATERIALS, 2009, 21 (24) :5848-5859
[2]   Stability of solid oxide fuel cell components [J].
Badwal, SPS .
SOLID STATE IONICS, 2001, 143 (01) :39-46
[3]   X-RAY PHOTOELECTRON-SPECTROSCOPY STUDY OF THE CATION VALENCIES IN NICKEL MANGANITE [J].
BRABERS, VAM ;
VANSETTEN, FM ;
KNAPEN, PSA .
JOURNAL OF SOLID STATE CHEMISTRY, 1983, 49 (01) :93-98
[4]   Solid solubilities of (La Nd,)2(Zr,Ti)2O7 phases deduced by neutron diffraction [J].
Harvey, EJ ;
Whittle, KR ;
Lumpkin, GR ;
Smith, RI ;
Redfern, SAT .
JOURNAL OF SOLID STATE CHEMISTRY, 2005, 178 (03) :800-810
[5]   Issues on development of (La,Sr)MnO3 cathode for solid oxide fuel cells [J].
Jiang, SP .
JOURNAL OF POWER SOURCES, 2003, 124 (02) :390-402
[6]   Effect of sintering temperature on microstructure and performance of LSM-YSZ composite cathodes [J].
Jorgensen, MJ ;
Primdahl, S ;
Bagger, C ;
Mogensen, M .
SOLID STATE IONICS, 2001, 139 (1-2) :1-11
[7]   Fabrication and evaluation of the electrochemical performance of the anode-supported solid oxide fuel cell with the composite cathode of La0.8Sr0.2Mn3-δ-Gadolinia-doped ceria oxide/La0.8Sr0.2MnO3-δ [J].
Kao, Wei-Xin ;
Lee, Maw-Chwain ;
Chang, Yang-Chuang ;
Lin, Tai-Nan ;
Wang, Chun-Hsiu ;
Chang, Jen-Chen .
JOURNAL OF POWER SOURCES, 2010, 195 (19) :6468-6472
[8]   Crystal structure, thermochemical stability, electrical and magnetic properties of the two-phase composites in the La0.8Sr0.2MnO3 ± δ-CeO2 system [J].
Konysheva, Elena ;
Irvine, John T. S. ;
Besmehn, Astrid .
SOLID STATE IONICS, 2009, 180 (11-13) :778-783
[9]   Origin of cathodic degradation and new phase formation at the La0.9Sr0.1MnO3/YSZ interface [J].
Lee, HY ;
Oh, SM .
SOLID STATE IONICS, 1996, 90 (1-4) :133-140
[10]   Effect of temperature on the porosity, microstructure, and properties of porous La0.8Sr0.2MnO3 cathode materials [J].
Li, Guo-Jun ;
Sun, Zhan-Ru ;
Zhao, Hong ;
Chen, Chun-Huan ;
Ren, Rui-Ming .
CERAMICS INTERNATIONAL, 2007, 33 (08) :1503-1507